[Bug 1709] New: gethostent_r incorrectly tests pointer validity

[bugzilla-daemon at rtems.org]

https://www.rtems.org/bugzilla/show_bug.cgi?id=1709

           Summary: gethostent_r incorrectly tests pointer validity
           Product: RTEMS
           Version: HEAD
          Platform: All
        OS/Version: RTEMS
            Status: NEW
          Severity: normal
          Priority: P3
         Component: networking
        AssignedTo: norume at aps.anl.gov
        ReportedBy: timcussins at eml.cc


Created an attachment (id=1054)
 --> (https://www.rtems.org/bugzilla/attachment.cgi?id=1054)
Recommended bugfix for hostf validity test

struct hostent* gethostent_r(char* buf, int len)

is defined in cpukit/libnetworking/libc/gethostbyht.c

and tests variable 'hostf' for validity (line 226) using

if (hostf<0) return 0;

hostf, when invalid, can also be NULL, so I recommend changing this to

if (hostf<=0) return 0;

see attached :)

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